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The Tokyo Stock Exchange has launched an...

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The Tokyo Stock Exchange has launched an investigation into unusual share trading activity that took place this month before a $135-million corporate deal, Finance Ministry officials confirmed. Shares in Nissan Construction, a building contractor, attracted exceptional buying demand Nov. 11, when they rose 10%. After the market closed that day, it was announced that Hitachi Zosen, an indebted shipbuilder, was selling its 36.7% stake in the company to Nichii, a leading supermarket chain.

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